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6ad0bfa0 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
b2a60966 16/* $Id$ */
17
6ad0bfa0 18//_________________________________________________________________________
b2a60966 19// Implementation version v1 of the PHOS particle identifier
7acf6008 20// Particle identification based on the
148b2bba 21// - RCPV: distance from CPV recpoint to EMCA recpoint.
22// - TOF
23// - PCA: Principal Components Analysis..
24// The identified particle has an identification number corresponding
25// to a 9 bits number:
bc0c084c 26// -Bit 0 to 2: bit set if RCPV > CpvEmcDistance (each bit corresponds
148b2bba 27// to a different efficiency-purity point of the photon identification)
bc0c084c 28// -Bit 3 to 5: bit set if TOF < TimeGate (each bit corresponds
148b2bba 29// to a different efficiency-purity point of the photon identification)
30// -Bit 6 to 9: bit set if Principal Components are
50739f15 31// inside an ellipse defined by the parameters a, b, c, x0 and y0.
148b2bba 32// (each bit corresponds to a different efficiency-purity point of the
50739f15 33// photon identification)
34// The PCA (Principal components analysis) needs a file that contains
35// a previous analysis of the correlations between the particles. This
bc0c084c 36// file is $ALICE_ROOT/PHOS/PCA8pa15_0.5-100.root. Analysis done for
50739f15 37// energies between 0.5 and 100 GeV.
9fa5f1d0 38// A calibrated energy is calculated. The energy of the reconstructed
50739f15 39// cluster is corrected with the formula A + B * E + C * E^2, whose
bc0c084c 40// parameters where obtained through the study of the reconstructed
50739f15 41// energy distribution of monoenergetic photons.
a4e98857 42//
bc0c084c 43// All the parameters (RCPV(2 rows-3 columns),TOF(1r-3c),PCA(5r-4c)
50739f15 44// and calibration(1r-3c))are stored in a file called
45// $ALICE_ROOT/PHOS/Parameters.dat. Each time that AliPHOSPIDv1 is
bc0c084c 46// initialized, this parameters are copied to a Matrix (9,4), a
50739f15 47// TMatrixD object.
7acf6008 48//
a4e98857 49// use case:
50739f15 50// root [0] AliPHOSPIDv1 * p = new AliPHOSPIDv1("galice1.root")
a4e98857 51// Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
50739f15 52// // reading headers from file galice1.root and create RecParticles
53 // TrackSegments and RecPoints are used
54// // set file name for the branch RecParticles
f0a4c9e9 55// root [1] p->ExecuteTask("deb all time")
50739f15 56// // available options
57// // "deb" - prints # of reconstructed particles
58// // "deb all" - prints # and list of RecParticles
59// // "time" - prints benchmarking results
7acf6008 60//
50739f15 61// root [2] AliPHOSPIDv1 * p2 = new AliPHOSPIDv1("galice1.root","v1",kTRUE)
148b2bba 62// Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
50739f15 63// //Split mode.
f0a4c9e9 64// root [3] p2->ExecuteTask()
65//
50739f15 66
f0a4c9e9 67
7acf6008 68//*-- Author: Yves Schutz (SUBATECH) & Gines Martinez (SUBATECH) &
148b2bba 69// Gustavo Conesa April 2002
50739f15 70// PCA redesigned by Gustavo Conesa October 2002:
71// The way of using the PCA has changed. Instead of 2
72// files with the PCA, each one with different energy ranges
73// of application, we use the wide one (0.5-100 GeV), and instead
bc0c084c 74// of fixing 3 ellipses for different ranges of energy, it has been
50739f15 75// studied the dependency of the ellipses parameters with the
76// energy, and they are implemented in the code as a funtion
77// of the energy.
78//
79//
80//
6ad0bfa0 81// --- ROOT system ---
7acf6008 82#include "TROOT.h"
83#include "TTree.h"
84#include "TFile.h"
e3817e5f 85#include "TF2.h"
86#include "TFormula.h"
87#include "TCanvas.h"
88#include "TFolder.h"
7acf6008 89#include "TSystem.h"
90#include "TBenchmark.h"
148b2bba 91#include "TMatrixD.h"
92#include "TPrincipal.h"
e3817e5f 93#include "TSystem.h"
148b2bba 94
6ad0bfa0 95// --- Standard library ---
96
75a6835b 97
6ad0bfa0 98// --- AliRoot header files ---
99
7acf6008 100#include "AliGenerator.h"
e3817e5f 101#include "AliPHOS.h"
26d4b141 102#include "AliPHOSPIDv1.h"
e3817e5f 103#include "AliPHOSClusterizerv1.h"
d956e9b7 104#include "AliPHOSEmcRecPoint.h"
6ad0bfa0 105#include "AliPHOSTrackSegment.h"
e3817e5f 106#include "AliPHOSTrackSegmentMakerv1.h"
6ad0bfa0 107#include "AliPHOSRecParticle.h"
7b7c1533 108#include "AliPHOSGeometry.h"
109#include "AliPHOSGetter.h"
6ad0bfa0 110
26d4b141 111ClassImp( AliPHOSPIDv1)
6ad0bfa0 112
1cb7c1ee 113//____________________________________________________________________________
114AliPHOSPIDv1::AliPHOSPIDv1():AliPHOSPID()
115{
a4e98857 116 // default ctor
148b2bba 117
8d0f3f77 118 InitParameters() ;
92f521a9 119 fDefaultInit = kTRUE ;
7acf6008 120}
121
581354c5 122//____________________________________________________________________________
88cb7938 123AliPHOSPIDv1::AliPHOSPIDv1(const AliPHOSPIDv1 & pid ):AliPHOSPID(pid)
581354c5 124{
386aef34 125 // ctor
581354c5 126 InitParameters() ;
581354c5 127 Init() ;
581354c5 128
129}
130
7acf6008 131//____________________________________________________________________________
88cb7938 132AliPHOSPIDv1::AliPHOSPIDv1(const TString alirunFileName, const TString eventFolderName):AliPHOSPID(alirunFileName, eventFolderName)
7acf6008 133{
a4e98857 134 //ctor with the indication on where to look for the track segments
7b7c1533 135
8d0f3f77 136 InitParameters() ;
2bd5457f 137 Init() ;
92f521a9 138 fDefaultInit = kFALSE ;
7acf6008 139}
7b7c1533 140
7acf6008 141//____________________________________________________________________________
142AliPHOSPIDv1::~AliPHOSPIDv1()
143{
79bb1b62 144 // dtor
9fa5f1d0 145
e3817e5f 146 delete [] fX ; // Principal input
147 delete [] fPPhoton ; // Photon Principal components
148 delete [] fPPi0 ; // Pi0 Principal components
7acf6008 149}
a496c46c 150//____________________________________________________________________________
151const TString AliPHOSPIDv1::BranchName() const
152{
88cb7938 153
154 return GetName() ;
a496c46c 155}
156
148b2bba 157//____________________________________________________________________________
158void AliPHOSPIDv1::Init()
159{
160 // Make all memory allocations that are not possible in default constructor
161 // Add the PID task to the list of PHOS tasks
a496c46c 162
88cb7938 163 AliPHOSGetter * gime = AliPHOSGetter::Instance(GetTitle(), fEventFolderName.Data()) ;
164
165 if ( !gime->PID() )
166 gime->PostPID(this) ;
148b2bba 167}
8d0f3f77 168
169//____________________________________________________________________________
170void AliPHOSPIDv1::InitParameters()
171{
e3817e5f 172 // Initialize PID parameters
8d0f3f77 173 fRecParticlesInRun = 0 ;
8d0f3f77 174 fNEvent = 0 ;
8d0f3f77 175 fRecParticlesInRun = 0 ;
9fa5f1d0 176 SetParameters() ; // fill the parameters matrix from parameters file
eabde521 177 SetEventRange(0,-1) ;
8d0f3f77 178}
179
88cb7938 180//________________________________________________________________________
eabde521 181void AliPHOSPIDv1::Exec(Option_t *option)
88cb7938 182{
eabde521 183 // Steering method to perform particle reconstruction and identification
184 // for the event range from fFirstEvent to fLastEvent.
185 // This range is optionally set by SetEventRange().
186 // if fLastEvent=-1 (by default), then process events until the end.
61d3d6aa 187
88cb7938 188 if(strstr(option,"tim"))
189 gBenchmark->Start("PHOSPID");
190
191 if(strstr(option,"print")) {
192 Print() ;
193 return ;
194 }
195
196
fb43ada4 197 AliPHOSGetter * gime = AliPHOSGetter::Instance(GetTitle()) ;
88cb7938 198
71cee46d 199 if (fLastEvent == -1)
200 fLastEvent = gime->MaxEvent() - 1 ;
201 else
202 fLastEvent = TMath::Min(fLastEvent,gime->MaxEvent());
eabde521 203 Int_t nEvents = fLastEvent - fFirstEvent + 1;
88cb7938 204
71cee46d 205 Int_t ievent ;
206 for (ievent = fFirstEvent; ievent <= fLastEvent; ievent++) {
88cb7938 207 gime->Event(ievent,"TR") ;
208 if(gime->TrackSegments() && //Skip events, where no track segments made
209 gime->TrackSegments()->GetEntriesFast()) {
210 MakeRecParticles() ;
90cceaf6 211 WriteRecParticles();
88cb7938 212 if(strstr(option,"deb"))
213 PrintRecParticles(option) ;
214 //increment the total number of rec particles per run
215 fRecParticlesInRun += gime->RecParticles()->GetEntriesFast() ;
216 }
217 }
ff417097 218 if(strstr(option,"deb"))
219 PrintRecParticles(option);
88cb7938 220 if(strstr(option,"tim")){
221 gBenchmark->Stop("PHOSPID");
222 Info("Exec", "took %f seconds for PID %f seconds per event",
223 gBenchmark->GetCpuTime("PHOSPID"),
eabde521 224 gBenchmark->GetCpuTime("PHOSPID")/nEvents) ;
88cb7938 225 }
88cb7938 226 Unload();
227}
228
69183710 229//____________________________________________________________________________
e3817e5f 230const TString AliPHOSPIDv1::GetFileNamePrincipal(TString particle) const
148b2bba 231{
e3817e5f 232 //Get file name that contains the PCA for a particle ("photon or pi0")
233 particle.ToLower();
234 TString name;
235 if (particle=="photon") name = fFileNamePrincipalPhoton ;
236 else if (particle=="pi0" ) name = fFileNamePrincipalPi0 ;
237 else Error("GetFileNamePrincipal","Wrong particle name: %s (choose from pi0/photon)\n",particle.Data());
238 return name;
239}
bc0c084c 240
e3817e5f 241//____________________________________________________________________________
fc7e2f43 242Float_t AliPHOSPIDv1::GetParameterCalibration(Int_t i) const
e3817e5f 243{
244 // Get the i-th parameter "Calibration"
245 Float_t param = 0.;
246 if (i>2 || i<0)
247 Error("GetParameterCalibration","Invalid parameter number: %d",i);
9fa5f1d0 248 else
e3817e5f 249 param = (*fParameters)(0,i);
250 return param;
251}
bc0c084c 252
88cb7938 253//____________________________________________________________________________
fc7e2f43 254Float_t AliPHOSPIDv1::GetCalibratedEnergy(Float_t e) const
88cb7938 255{
256// It calibrates Energy depending on the recpoint energy.
257// The energy of the reconstructed cluster is corrected with
258// the formula A + B* E + C* E^2, whose parameters where obtained
259// through the study of the reconstructed energy distribution of
260// monoenergetic photons.
261
262 Float_t p[]={0.,0.,0.};
263 for (Int_t i=0; i<3; i++) p[i] = GetParameterCalibration(i);
264 Float_t enerec = p[0] + p[1]*e + p[2]*e*e;
265 return enerec ;
266
267}
268
e3817e5f 269//____________________________________________________________________________
fc7e2f43 270Float_t AliPHOSPIDv1::GetParameterCpv2Emc(Int_t i, TString axis) const
e3817e5f 271{
272 // Get the i-th parameter "CPV-EMC distance" for the specified axis
273 Float_t param = 0.;
274 if(i>2 || i<0)
275 Error("GetParameterCpv2Emc","Invalid parameter number: %d",i);
276 else {
277 axis.ToLower();
278 if (axis == "x") param = (*fParameters)(1,i);
279 else if (axis == "z") param = (*fParameters)(2,i);
280 else Error("GetParameterCpv2Emc","Invalid axis name: %s",axis.Data());
281 }
282 return param;
283}
284
285//____________________________________________________________________________
fc7e2f43 286Float_t AliPHOSPIDv1::GetCpv2EmcDistanceCut(TString axis, Float_t e) const
e3817e5f 287{
88cb7938 288 // Get CpvtoEmcDistance Cut depending on the cluster energy, axis and
289 // Purity-Efficiency point
290
291 axis.ToLower();
292 Float_t p[]={0.,0.,0.};
293 for (Int_t i=0; i<3; i++) p[i] = GetParameterCpv2Emc(i,axis);
294 Float_t sig = p[0] + TMath::Exp(p[1] - p[2]*e);
295 return sig;
e3817e5f 296}
297
88cb7938 298//____________________________________________________________________________
fc7e2f43 299Float_t AliPHOSPIDv1::GetEllipseParameter(TString particle, TString param, Float_t e) const
88cb7938 300{
301 // Calculates the parameter param of the ellipse
e3817e5f 302
303 particle.ToLower();
304 param. ToLower();
88cb7938 305 Float_t p[4]={0.,0.,0.,0.};
306 Float_t value = 0.0;
307 for (Int_t i=0; i<4; i++) p[i] = GetParameterToCalculateEllipse(particle,param,i);
308 if (particle == "photon") {
309 if (param.Contains("a")) e = TMath::Min((Double_t)e,70.);
310 else if (param.Contains("b")) e = TMath::Min((Double_t)e,70.);
311 else if (param.Contains("x0")) e = TMath::Max((Double_t)e,1.1);
312 }
e3817e5f 313
88cb7938 314 value = p[0]/TMath::Sqrt(e) + p[1]*e + p[2]*e*e + p[3];
315 return value;
e3817e5f 316}
317
318//_____________________________________________________________________________
fc7e2f43 319Float_t AliPHOSPIDv1::GetParameterPhotonBoundary (Int_t i) const
e3817e5f 320{
321 // Get the parameter "i" to calculate the boundary on the moment M2x
322 // for photons at high p_T
323 Float_t param = 0;
324 if (i>3 || i<0)
325 Error("GetParameterPhotonBoundary","Wrong parameter number: %d\n",i);
326 else
327 param = (*fParameters)(14,i) ;
328 return param;
148b2bba 329}
e3817e5f 330
148b2bba 331//____________________________________________________________________________
fc7e2f43 332Float_t AliPHOSPIDv1::GetParameterPi0Boundary (Int_t i) const
e3817e5f 333{
334 // Get the parameter "i" to calculate the boundary on the moment M2x
335 // for pi0 at high p_T
336 Float_t param = 0;
337 if (i>2 || i<0)
338 Error("GetParameterPi0Boundary","Wrong parameter number: %d\n",i);
339 else
340 param = (*fParameters)(15,i) ;
341 return param;
342}
148b2bba 343
e3817e5f 344//____________________________________________________________________________
fc7e2f43 345Float_t AliPHOSPIDv1::GetParameterTimeGate(Int_t i) const
e3817e5f 346{
88cb7938 347 // Get TimeGate parameter depending on Purity-Efficiency i:
348 // i=0 - Low purity, i=1 - Medium purity, i=2 - High purity
349 Float_t param = 0.;
e3817e5f 350 if(i>2 || i<0)
88cb7938 351 Error("GetParameterTimeGate","Invalid Efficiency-Purity choice %d",i);
e3817e5f 352 else
88cb7938 353 param = (*fParameters)(3,i) ;
354 return param;
e3817e5f 355}
356
148b2bba 357//_____________________________________________________________________________
fc7e2f43 358Float_t AliPHOSPIDv1::GetParameterToCalculateEllipse(TString particle, TString param, Int_t i) const
88cb7938 359{
360 // Get the parameter "i" that is needed to calculate the ellipse
361 // parameter "param" for the particle "particle" ("photon" or "pi0")
362
e3817e5f 363 particle.ToLower();
364 param. ToLower();
88cb7938 365 Int_t offset = -1;
e3817e5f 366 if (particle == "photon") offset=0;
367 else if (particle == "pi0") offset=5;
368 else
88cb7938 369 Error("GetParameterToCalculateEllipse","Wrong particle name: %s (choose from pi0/photon)\n",particle.Data());
370
371 Int_t p= -1;
372 Float_t par = 0;
e3817e5f 373
374 if (param.Contains("a")) p=4+offset;
375 else if(param.Contains("b")) p=5+offset;
376 else if(param.Contains("c")) p=6+offset;
377 else if(param.Contains("x0"))p=7+offset;
378 else if(param.Contains("y0"))p=8+offset;
12022e83 379
88cb7938 380 if (i>4 || i<0)
381 Error("GetParameterToCalculateEllipse", "No parameter with index", i) ;
382 else if (p==-1)
383 Error("GetParameterToCalculateEllipse", "No parameter with name %s", param.Data() ) ;
12022e83 384 else
88cb7938 385 par = (*fParameters)(p,i) ;
386
387 return par;
12022e83 388}
389
12022e83 390
391//____________________________________________________________________________
8d4608b5 392Float_t AliPHOSPIDv1::GetDistance(AliPHOSEmcRecPoint * emc,AliPHOSCpvRecPoint * cpv, Option_t * axis)const
69183710 393{
394 // Calculates the distance between the EMC RecPoint and the PPSD RecPoint
148b2bba 395
88cb7938 396 const AliPHOSGeometry * geom = AliPHOSGetter::Instance()->PHOSGeometry() ;
69183710 397 TVector3 vecEmc ;
7acf6008 398 TVector3 vecCpv ;
148b2bba 399 if(cpv){
400 emc->GetLocalPosition(vecEmc) ;
401 cpv->GetLocalPosition(vecCpv) ;
2bb500e5 402
148b2bba 403 if(emc->GetPHOSMod() == cpv->GetPHOSMod()){
404 // Correct to difference in CPV and EMC position due to different distance to center.
405 // we assume, that particle moves from center
406 Float_t dCPV = geom->GetIPtoOuterCoverDistance();
407 Float_t dEMC = geom->GetIPtoCrystalSurface() ;
408 dEMC = dEMC / dCPV ;
409 vecCpv = dEMC * vecCpv - vecEmc ;
e3817e5f 410 if (axis == "X") return vecCpv.X();
411 if (axis == "Y") return vecCpv.Y();
412 if (axis == "Z") return vecCpv.Z();
413 if (axis == "R") return vecCpv.Mag();
414 }
148b2bba 415 return 100000000 ;
416 }
7acf6008 417 return 100000000 ;
69183710 418}
bc0c084c 419//____________________________________________________________________________
8d4608b5 420Int_t AliPHOSPIDv1::GetCPVBit(AliPHOSEmcRecPoint * emc,AliPHOSCpvRecPoint * cpv, Int_t effPur, Float_t e) const
bc0c084c 421{
e3817e5f 422 if(effPur>2 || effPur<0)
423 Error("GetCPVBit","Invalid Efficiency-Purity choice %d",effPur);
bc0c084c 424
e3817e5f 425 Float_t sigX = GetCpv2EmcDistanceCut("X",e);
426 Float_t sigZ = GetCpv2EmcDistanceCut("Z",e);
bc0c084c 427
428 Float_t deltaX = TMath::Abs(GetDistance(emc, cpv, "X"));
429 Float_t deltaZ = TMath::Abs(GetDistance(emc, cpv, "Z"));
8d4608b5 430
e3817e5f 431 if((deltaX>sigX*(effPur+1))|(deltaZ>sigZ*(effPur+1)))
bc0c084c 432 return 1;//Neutral
433 else
434 return 0;//Charged
bc0c084c 435}
69183710 436
6ad0bfa0 437//____________________________________________________________________________
fc7e2f43 438Int_t AliPHOSPIDv1::GetPrincipalBit(TString particle, const Double_t* p, Int_t effPur, Float_t e)const
148b2bba 439{
50739f15 440 //Is the particle inside de PCA ellipse?
581354c5 441
e3817e5f 442 particle.ToLower();
443 Int_t prinbit = 0 ;
444 Float_t a = GetEllipseParameter(particle,"a" , e);
445 Float_t b = GetEllipseParameter(particle,"b" , e);
446 Float_t c = GetEllipseParameter(particle,"c" , e);
447 Float_t x0 = GetEllipseParameter(particle,"x0", e);
448 Float_t y0 = GetEllipseParameter(particle,"y0", e);
449
450 Float_t r = TMath::Power((p[0] - x0)/a,2) +
451 TMath::Power((p[1] - y0)/b,2) +
452 c*(p[0] - x0)*(p[1] - y0)/(a*b) ;
50739f15 453 //3 different ellipses defined
e3817e5f 454 if((effPur==2) && (r<1./2.)) prinbit= 1;
455 if((effPur==1) && (r<2. )) prinbit= 1;
456 if((effPur==0) && (r<9./2.)) prinbit= 1;
50739f15 457
581354c5 458 if(r<0)
e3817e5f 459 Error("GetPrincipalBit", "Negative square?") ;
1f0e7ccd 460
461 return prinbit;
148b2bba 462
148b2bba 463}
1f0e7ccd 464//____________________________________________________________________________
fc7e2f43 465Int_t AliPHOSPIDv1::GetHardPhotonBit(AliPHOSEmcRecPoint * emc) const
1f0e7ccd 466{
e3817e5f 467 // Set bit for identified hard photons (E > 30 GeV)
468 // if the second moment M2x is below the boundary
469
470 Float_t e = emc->GetEnergy();
471 if (e < 30.0) return 0;
472 Float_t m2x = emc->GetM2x();
473 Float_t m2xBoundary = GetParameterPhotonBoundary(0) *
474 TMath::Exp(-TMath::Power(e-GetParameterPhotonBoundary(1),2)/2.0/
475 TMath::Power(GetParameterPhotonBoundary(2),2)) +
476 GetParameterPhotonBoundary(3);
61d3d6aa 477 //Info("GetHardPhotonBit","E=%f, m2x=%f, boundary=%f",e,m2x,m2xBoundary);
e3817e5f 478 if (m2x < m2xBoundary)
479 return 1;// A hard photon
480 else
481 return 0;// Not a hard photon
1f0e7ccd 482}
92f521a9 483
e3817e5f 484//____________________________________________________________________________
fc7e2f43 485Int_t AliPHOSPIDv1::GetHardPi0Bit(AliPHOSEmcRecPoint * emc) const
e3817e5f 486{
487 // Set bit for identified hard pi0 (E > 30 GeV)
488 // if the second moment M2x is above the boundary
489
490 Float_t e = emc->GetEnergy();
491 if (e < 30.0) return 0;
492 Float_t m2x = emc->GetM2x();
493 Float_t m2xBoundary = GetParameterPi0Boundary(0) +
494 e * GetParameterPi0Boundary(1);
61d3d6aa 495 //Info("GetHardPi0Bit","E=%f, m2x=%f, boundary=%f",e,m2x,m2xBoundary);
e3817e5f 496 if (m2x > m2xBoundary)
497 return 1;// A hard pi0
bc0c084c 498 else
e3817e5f 499 return 0;// Not a hard pi0
f0a4c9e9 500}
e3817e5f 501
502//____________________________________________________________________________
8d4608b5 503TVector3 AliPHOSPIDv1::GetMomentumDirection(AliPHOSEmcRecPoint * emc, AliPHOSCpvRecPoint * )const
88cb7938 504{
505 // Calculates the momentum direction:
506 // 1. if only a EMC RecPoint, direction is given by IP and this RecPoint
507 // 2. if a EMC RecPoint and CPV RecPoint, direction is given by the line through the 2 recpoints
508 // However because of the poor position resolution of PPSD the direction is always taken as if we were
509 // in case 1.
f0a4c9e9 510
88cb7938 511 TVector3 dir(0,0,0) ;
9688c1dd 512
88cb7938 513 TVector3 emcglobalpos ;
514 TMatrix dummy ;
bf8f1fbd 515
88cb7938 516 emc->GetGlobalPosition(emcglobalpos, dummy) ;
bf8f1fbd 517
fbf811ec 518
88cb7938 519 dir = emcglobalpos ;
88cb7938 520 dir.SetMag(1.) ;
e3817e5f 521
88cb7938 522 //account correction to the position of IP
523 Float_t xo,yo,zo ; //Coordinates of the origin
524 gAlice->Generator()->GetOrigin(xo,yo,zo) ;
525 TVector3 origin(xo,yo,zo);
526 dir = dir - origin ;
e3817e5f 527
88cb7938 528 return dir ;
7b7c1533 529}
530
7acf6008 531//____________________________________________________________________________
e3817e5f 532void AliPHOSPIDv1::MakeRecParticles()
533{
b2a60966 534 // Makes a RecParticle out of a TrackSegment
148b2bba 535
88cb7938 536 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
fbf811ec 537 TObjArray * emcRecPoints = gime->EmcRecPoints() ;
538 TObjArray * cpvRecPoints = gime->CpvRecPoints() ;
539 TClonesArray * trackSegments = gime->TrackSegments() ;
148b2bba 540 if ( !emcRecPoints || !cpvRecPoints || !trackSegments ) {
f1611b7c 541 Fatal("MakeRecParticles", "RecPoints or TrackSegments not found !") ;
148b2bba 542 }
fbf811ec 543 TClonesArray * recParticles = gime->RecParticles() ;
01a599c9 544 recParticles->Clear();
148b2bba 545
7b7c1533 546 TIter next(trackSegments) ;
7acf6008 547 AliPHOSTrackSegment * ts ;
6ad0bfa0 548 Int_t index = 0 ;
09fc14a0 549 AliPHOSRecParticle * rp ;
7acf6008 550 while ( (ts = (AliPHOSTrackSegment *)next()) ) {
fad3e5b9 551
7b7c1533 552 new( (*recParticles)[index] ) AliPHOSRecParticle() ;
553 rp = (AliPHOSRecParticle *)recParticles->At(index) ;
f0a4c9e9 554 rp->SetTrackSegment(index) ;
9688c1dd 555 rp->SetIndexInList(index) ;
148b2bba 556
7acf6008 557 AliPHOSEmcRecPoint * emc = 0 ;
558 if(ts->GetEmcIndex()>=0)
7b7c1533 559 emc = (AliPHOSEmcRecPoint *) emcRecPoints->At(ts->GetEmcIndex()) ;
fad3e5b9 560
8d4608b5 561 AliPHOSCpvRecPoint * cpv = 0 ;
7acf6008 562 if(ts->GetCpvIndex()>=0)
8d4608b5 563 cpv = (AliPHOSCpvRecPoint *) cpvRecPoints->At(ts->GetCpvIndex()) ;
fad3e5b9 564
148b2bba 565 // Now set type (reconstructed) of the particle
566
567 // Choose the cluster energy range
9fa5f1d0 568
fbf811ec 569 if (!emc) {
f1611b7c 570 Fatal("MakeRecParticles", "-> emc(%d) = %d", ts->GetEmcIndex(), emc ) ;
fbf811ec 571 }
50739f15 572
e3817e5f 573 Float_t e = emc->GetEnergy() ;
bc0c084c 574
6f969528 575 Float_t lambda[2] ;
576 emc->GetElipsAxis(lambda) ;
50739f15 577
578 if((lambda[0]>0.01) && (lambda[1]>0.01)){
579 // Looking PCA. Define and calculate the data (X),
bc0c084c 580 // introduce in the function X2P that gives the components (P).
581
e3817e5f 582 Float_t Spher = 0. ;
583 Float_t Emaxdtotal = 0. ;
50739f15 584
bc0c084c 585 if((lambda[0]+lambda[1])!=0)
e3817e5f 586 Spher=fabs(lambda[0]-lambda[1])/(lambda[0]+lambda[1]);
50739f15 587
e3817e5f 588 Emaxdtotal=emc->GetMaximalEnergy()/emc->GetEnergy();
50739f15 589
590 fX[0] = lambda[0] ;
591 fX[1] = lambda[1] ;
592 fX[2] = emc->GetDispersion() ;
e3817e5f 593 fX[3] = Spher ;
50739f15 594 fX[4] = emc->GetMultiplicity() ;
e3817e5f 595 fX[5] = Emaxdtotal ;
50739f15 596 fX[6] = emc->GetCoreEnergy() ;
597
e3817e5f 598 fPrincipalPhoton->X2P(fX,fPPhoton);
599 fPrincipalPi0 ->X2P(fX,fPPi0);
1f0e7ccd 600
50739f15 601 }
602 else{
e3817e5f 603 fPPhoton[0]=-100.0; //We do not accept clusters with
604 fPPhoton[1]=-100.0; //one cell as a photon-like
605 fPPi0[0] =-100.0;
606 fPPi0[1] =-100.0;
50739f15 607 }
608
6f969528 609 Float_t time =emc->GetTime() ;
9fa5f1d0 610
bc0c084c 611 // Loop of Efficiency-Purity (the 3 points of purity or efficiency
612 // are taken into account to set the particle identification)
e3817e5f 613 for(Int_t effPur = 0; effPur < 3 ; effPur++){
50739f15 614
bc0c084c 615 // Looking at the CPV detector. If RCPV greater than CpvEmcDistance,
616 // 1st,2nd or 3rd bit (depending on the efficiency-purity point )
617 // is set to 1
e3817e5f 618 if(GetCPVBit(emc, cpv, effPur,e) == 1 )
619 rp->SetPIDBit(effPur) ;
f0a4c9e9 620
50739f15 621 // Looking the TOF. If TOF smaller than gate, 4th, 5th or 6th
622 // bit (depending on the efficiency-purity point )is set to 1
e3817e5f 623 if(time< (*fParameters)(2,effPur))
624 rp->SetPIDBit(effPur+3) ;
50739f15 625
e3817e5f 626 //Photon PCA
50739f15 627 //If we are inside the ellipse, 7th, 8th or 9th
628 // bit (depending on the efficiency-purity point )is set to 1
e3817e5f 629 if(GetPrincipalBit("photon",fPPhoton,effPur,e) == 1)
630 rp->SetPIDBit(effPur+6) ;
1f0e7ccd 631
e3817e5f 632 //Pi0 PCA
1f0e7ccd 633 //If we are inside the ellipse, 10th, 11th or 12th
634 // bit (depending on the efficiency-purity point )is set to 1
e3817e5f 635 if(GetPrincipalBit("pi0" ,fPPi0 ,effPur,e) == 1)
636 rp->SetPIDBit(effPur+9) ;
f0a4c9e9 637 }
e3817e5f 638 if(GetHardPhotonBit(emc))
639 rp->SetPIDBit(12) ;
640 if(GetHardPi0Bit (emc))
641 rp->SetPIDBit(13) ;
1f0e7ccd 642
9fa5f1d0 643 //Set momentum, energy and other parameters
50739f15 644 Float_t encal = GetCalibratedEnergy(e);
9fa5f1d0 645 TVector3 dir = GetMomentumDirection(emc,cpv) ;
646 dir.SetMag(encal) ;
647 rp->SetMomentum(dir.X(),dir.Y(),dir.Z(),encal) ;
648 rp->SetCalcMass(0);
e0ed2e49 649 rp->Name(); //If photon sets the particle pdg name to gamma
e747b8da 650 rp->SetProductionVertex(0,0,0,0);
651 rp->SetFirstMother(-1);
652 rp->SetLastMother(-1);
653 rp->SetFirstDaughter(-1);
654 rp->SetLastDaughter(-1);
655 rp->SetPolarisation(0,0,0);
d956e9b7 656 //Set the position in global coordinate system from the RecPoint
657 AliPHOSGeometry * geom = gime->PHOSGeometry() ;
658 AliPHOSTrackSegment * ts = gime->TrackSegment(rp->GetPHOSTSIndex()) ;
659 AliPHOSEmcRecPoint * erp = gime->EmcRecPoint(ts->GetEmcIndex()) ;
660 TVector3 pos ;
661 geom->GetGlobal(erp, pos) ;
662 rp->SetPos(pos);
663
6ad0bfa0 664 index++ ;
665 }
6ad0bfa0 666}
e3817e5f 667
09fc14a0 668//____________________________________________________________________________
88cb7938 669void AliPHOSPIDv1::Print() const
09fc14a0 670{
b2a60966 671 // Print the parameters used for the particle type identification
bc0c084c 672
88cb7938 673 Info("Print", "=============== AliPHOSPIDv1 ================") ;
674 printf("Making PID\n") ;
675 printf(" Pricipal analysis file from 0.5 to 100 %s\n", fFileNamePrincipalPhoton.Data() ) ;
676 printf(" Name of parameters file %s\n", fFileNameParameters.Data() ) ;
677 printf(" Matrix of Parameters: 14x4\n") ;
678 printf(" Energy Calibration 1x3 [3 parametres to calibrate energy: A + B* E + C * E^2]\n") ;
679 printf(" RCPV 2x3 rows x and z, columns function cut parameters\n") ;
680 printf(" TOF 1x3 [High Eff-Low Pur,Medium Eff-Pur, Low Eff-High Pur]\n") ;
681 printf(" PCA 5x4 [5 ellipse parametres and 4 parametres to calculate them: A/Sqrt(E) + B* E + C * E^2 + D]\n") ;
682 Printf(" Pi0 PCA 5x3 [5 ellipse parametres and 3 parametres to calculate them: A + B* E + C * E^2]\n") ;
50739f15 683 fParameters->Print() ;
09fc14a0 684}
685
a496c46c 686
69183710 687
7acf6008 688//____________________________________________________________________________
a4e98857 689void AliPHOSPIDv1::PrintRecParticles(Option_t * option)
690{
dd5c4038 691 // Print table of reconstructed particles
692
88cb7938 693 AliPHOSGetter *gime = AliPHOSGetter::Instance() ;
bf8f1fbd 694
88cb7938 695 TClonesArray * recParticles = gime->RecParticles() ;
21cd0c07 696
697 TString message ;
3bf72d32 698 message = "\nevent " ;
699 message += gAlice->GetEvNumber() ;
700 message += " found " ;
701 message += recParticles->GetEntriesFast();
702 message += " RecParticles\n" ;
703
7acf6008 704 if(strstr(option,"all")) { // printing found TS
3bf72d32 705 message += "\n PARTICLE Index \n" ;
7acf6008 706
707 Int_t index ;
7b7c1533 708 for (index = 0 ; index < recParticles->GetEntries() ; index++) {
21cd0c07 709 AliPHOSRecParticle * rp = (AliPHOSRecParticle * ) recParticles->At(index) ;
3bf72d32 710 message += "\n" ;
711 message += rp->Name().Data() ;
712 message += " " ;
713 message += rp->GetIndexInList() ;
714 message += " " ;
715 message += rp->GetType() ;
7acf6008 716 }
3bf72d32 717 }
718 Info("Print", message.Data() ) ;
69183710 719}
88cb7938 720
721//____________________________________________________________________________
722void AliPHOSPIDv1::SetParameters()
723{
724 // PCA : To do the Principal Components Analysis it is necessary
725 // the Principal file, which is opened here
726 fX = new double[7]; // Data for the PCA
727 fPPhoton = new double[7]; // Eigenvalues of the PCA
728 fPPi0 = new double[7]; // Eigenvalues of the Pi0 PCA
729
730 // Read photon principals from the photon file
731
732 fFileNamePrincipalPhoton = "$ALICE_ROOT/PHOS/PCA8pa15_0.5-100.root" ;
733 TFile f( fFileNamePrincipalPhoton.Data(), "read" ) ;
734 fPrincipalPhoton = dynamic_cast<TPrincipal*> (f.Get("principal")) ;
735 f.Close() ;
736
737 // Read pi0 principals from the pi0 file
738
739 fFileNamePrincipalPi0 = "$ALICE_ROOT/PHOS/PCA_pi0_40-120.root" ;
740 TFile fPi0( fFileNamePrincipalPi0.Data(), "read" ) ;
741 fPrincipalPi0 = dynamic_cast<TPrincipal*> (fPi0.Get("principal")) ;
742 fPi0.Close() ;
743
744 // Open parameters file and initialization of the Parameters matrix.
745 // In the File Parameters.dat are all the parameters. These are introduced
746 // in a matrix of 16x4
747 //
748 // All the parameters defined in this file are, in order of row:
749 // line 0 : calibration
750 // lines 1,2 : CPV rectangular cat for X and Z
751 // line 3 : TOF cut
752 // lines 4-8 : parameters to calculate photon PCA ellipse
753 // lines 9-13: parameters to calculate pi0 PCA ellipse
754 // lines 14-15: parameters to calculate border for high-pt photons and pi0
755
756 fFileNameParameters = gSystem->ExpandPathName("$ALICE_ROOT/PHOS/Parameters.dat");
757 fParameters = new TMatrix(16,4) ;
758 const Int_t maxLeng=255;
759 char string[maxLeng];
760
761 // Open a text file with PID parameters
762 FILE *fd = fopen(fFileNameParameters.Data(),"r");
763 if (!fd)
764 Fatal("SetParameter","File %s with a PID parameters cannot be opened\n",
765 fFileNameParameters.Data());
766
767 Int_t i=0;
768 // Read parameter file line-by-line and skip empty line and comments
769 while (fgets(string,maxLeng,fd) != NULL) {
770 if (string[0] == '\n' ) continue;
771 if (string[0] == '!' ) continue;
772 sscanf(string, "%f %f %f %f",
773 &(*fParameters)(i,0), &(*fParameters)(i,1),
774 &(*fParameters)(i,2), &(*fParameters)(i,3));
775 i++;
776 //printf("line %d: %s",i,string);
777 }
778 fclose(fd);
779}
780
781//____________________________________________________________________________
782void AliPHOSPIDv1::SetParameterCalibration(Int_t i,Float_t param)
783{
784 // Set parameter "Calibration" i to a value param
785 if(i>2 || i<0)
786 Error("SetParameterCalibration","Invalid parameter number: %d",i);
787 else
788 (*fParameters)(0,i) = param ;
789}
790
791//____________________________________________________________________________
792void AliPHOSPIDv1::SetParameterCpv2Emc(Int_t i, TString axis, Float_t cut)
793{
794 // Set the parameters to calculate Cpv-to-Emc Distance Cut depending on
795 // Purity-Efficiency point i
796
797 if(i>2 || i<0)
798 Error("SetParameterCpv2Emc","Invalid parameter number: %d",i);
799 else {
800 axis.ToLower();
801 if (axis == "x") (*fParameters)(1,i) = cut;
802 else if (axis == "z") (*fParameters)(2,i) = cut;
803 else Error("SetParameterCpv2Emc","Invalid axis name: %s",axis.Data());
804 }
805}
806
807//____________________________________________________________________________
808void AliPHOSPIDv1::SetParameterPhotonBoundary(Int_t i,Float_t param)
809{
810 // Set parameter "Hard photon boundary" i to a value param
811 if(i>4 || i<0)
812 Error("SetParameterPhotonBoundary","Invalid parameter number: %d",i);
813 else
814 (*fParameters)(14,i) = param ;
815}
816
817//____________________________________________________________________________
818void AliPHOSPIDv1::SetParameterPi0Boundary(Int_t i,Float_t param)
819{
820 // Set parameter "Hard pi0 boundary" i to a value param
821 if(i>1 || i<0)
822 Error("SetParameterPi0Boundary","Invalid parameter number: %d",i);
823 else
824 (*fParameters)(15,i) = param ;
825}
826
827//_____________________________________________________________________________
828void AliPHOSPIDv1::SetParameterTimeGate(Int_t i, Float_t gate)
829{
830 // Set the parameter TimeGate depending on Purity-Efficiency point i
831 if (i>2 || i<0)
832 Error("SetParameterTimeGate","Invalid Efficiency-Purity choice %d",i);
833 else
834 (*fParameters)(3,i)= gate ;
835}
836
837//_____________________________________________________________________________
838void AliPHOSPIDv1::SetParameterToCalculateEllipse(TString particle, TString param, Int_t i, Float_t par)
839{
840 // Set the parameter "i" that is needed to calculate the ellipse
841 // parameter "param" for a particle "particle"
842
843 particle.ToLower();
844 param. ToLower();
845 Int_t p= -1;
846 Int_t offset=0;
847
848 if (particle == "photon") offset=0;
849 else if (particle == "pi0") offset=5;
850 else
851 Error("SetParameterToCalculateEllipse","Wrong particle name: %s (choose from pi0/photon)\n",particle.Data());
852
853 if (param.Contains("a")) p=4+offset;
854 else if(param.Contains("b")) p=5+offset;
855 else if(param.Contains("c")) p=6+offset;
856 else if(param.Contains("x0"))p=7+offset;
857 else if(param.Contains("y0"))p=8+offset;
858 if((i>4)||(i<0))
859 Error("SetEllipseParameter", "No parameter with index %d", i) ;
860 else if(p==-1)
861 Error("SetEllipseParameter", "No parameter with name %s", param.Data() ) ;
862 else
863 (*fParameters)(p,i) = par ;
864}
865
866//____________________________________________________________________________
867void AliPHOSPIDv1::Unload()
868{
869 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
870 gime->PhosLoader()->UnloadRecPoints() ;
871 gime->PhosLoader()->UnloadTracks() ;
872 gime->PhosLoader()->UnloadRecParticles() ;
873}
874
875//____________________________________________________________________________
90cceaf6 876void AliPHOSPIDv1::WriteRecParticles()
88cb7938 877{
878
879 AliPHOSGetter *gime = AliPHOSGetter::Instance() ;
880
881 TClonesArray * recParticles = gime->RecParticles() ;
882 recParticles->Expand(recParticles->GetEntriesFast() ) ;
883 TTree * treeP = gime->TreeP();
884
885 //First rp
886 Int_t bufferSize = 32000 ;
887 TBranch * rpBranch = treeP->Branch("PHOSRP",&recParticles,bufferSize);
888 rpBranch->SetTitle(BranchName());
889
890 rpBranch->Fill() ;
891
892 gime->WriteRecParticles("OVERWRITE");
893 gime->WritePID("OVERWRITE");
894}
895